I haven't stayed at Movies, but I have stayed at Music about 4 times, Sports twice, and Pop once. Since all three All-Stars are virtually identical except for the theme, I can give you a comparrison I wrote a while back between Music and Pop and it will be valid for Movies, too.
Comparing Music directly to Pop:
*Pop is newer, cleaner, and has brighter colors and cooler icons on the buildings.
*Pop does not share busses, as Music does.
*Pop is more centrally located, so bus trips to MGM, Epcot, and DD are shorter. Trips to AK and MK are a little longer.
*Pop has real soaps, not dispensers.
*The beds at Pop are bricks. Music's beds are much more comfortable.
*The food court at Pop has a similar menu to Music, but the quality is sub-par. Music has much better food and slightly better service.
*The gift shop at Music is not connnected to the food court, so you don't have to walk through one to get to the other.
*Service in teh Music gift shop is much better than the one at Pop. Also, the storage room for packages delivered to the resort from the parks is behind the counter at Music, but across the building at Pop. At Pop it once took 30 minutes to get my package.
*Parking at Music is world better. The lots are huge and there are more rooms located close to the lots at Music than there are at Pop.
*Even though Music is more remote than Pop, driving yourself wipes out that advantage, because Music is at the end of Buena Vista Blvd, the main east-west road at WDW. Drive times to Epcot, MGM, both water parks, and DD are all 10 minutes or less, because they all have entrances on Buena Vista Blvd; AK is also less than 10 mins because it is so close, and MK is only about 12-15 minutes.
*Music is less crowded than Pop and has more buildings far away from Melody Hall, making it much quieter and more peaceful.
Overall, I like Music best of all the Values.